community/suitesparse: upgrade to 7.8.2

• https://github.com/DrTimothyAldenDavis/SuiteSparse/releases/tag/v7.8.2
• https://github.com/DrTimothyAldenDavis/SuiteSparse/releases/tag/v7.8.1
• https://github.com/DrTimothyAldenDavis/SuiteSparse/releases/tag/v7.8.1.beta1
• https://github.com/DrTimothyAldenDavis/SuiteSparse/releases/tag/v7.8.0

Also rebuild community/octave against suitesparse 7.8.2.

cc: @jirutka (suitesparse), @Celeste (octave)